Attachment plug



Jan. 16, 1940. N. CHIRELSTEIN 2,187,439

* ATTACHMENT PLUG Filed June 28, 1939 I NV EN TOR mama mast an,

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Patented Jan. 16, 1940 UNITED STATES PATENT OFFICE ATTACHMENT PLUG Nathan Chirelstein, Chicago, 11].

Application June 28, 1939, Serial No. 281,608

2 Claims. (01. 173-361) The invention here disclosed relates to electrlis composed Separated by the barrier H, and atcal attachment plugs. tached to the inner ends of blades extending Special objects of the invention are to provide through the front end passages 8. a plug of simple inexpensive construction, which The contact blades M, are shown as having .5 can be readily assembled into permanent form sharply angled base portions i 5, seating snugly b and which will be wholly practical and desirin the external seats 9, longitudinal portions 16, able. extended from said sharply angled base portions,

The novel features of the invention by which fitting in passages 8, sharply angled portions H, the foregoing and other desirable objects are atengaging the internal shoulders or inner faces tained are set forth and will appear in the course 12, and the relatively angled inner terminal ends in of the following specification. E8. The latter are shown as notched inward The drawing accompanying and forming part from one side at 59, to receive the wire ends, the of the specification illustrates one practical comwires preferably being soldered in position in such mercial embodiment of the invention. Details of notches.

construction however may be modified and The reversely angled portions 85, i1, together changed as regards this particular illustration, with the longitudinally extending connecting all within the true intent and broad scope of the portions it, constitute in effect sharply angled claims hereinafter. U-bends in the body or base portions of the con- Fig. 1 is a side elevation of one of the new tact blades and the proportions are preferably plugs. such that when the blades are located as in Fig. 2 is a front end view of the same. Fig. 3, the outer angled portions i5, will fit firmly Fig. 3 is a longitudinal sectional view on subagainst the outer face of the wall forming the end stantially the plane of line 3--3 of Fig. 2. of the plug, the intermediate portions I6, will Fig. 4 is a detached perspective view of one fit firmly in the passages 3, through said wall 9,5 of the blade members. and the reversely angled inner portions i1, will One of the special features of the invention firmly engage ,the inner face of the wall. So

is the molding of the plug body 5, in rubber or combined, the parts constitute a permanent assimilar insulating material, sufficiently resilient sembly in which the contacts can not be pushed or elastic, at least at the time of assembling, or pulled one way or the other, without de 30 to permit it to stretch enough for the plug blades stroying the plug.

to be drawn into locked position therein. To assemble the parts, it is necessary that In structure, the stretchable rubber-like body the plug material be resilient, at least temporariis formed, in the case illustrated, with an inter- 1y so, so that the blades, after the wires are atnal cavity or chamber 6, a cord passage 1, opentached on the outside, can be pulled through as ing through the back of the plug and relatively the blade passages to the fully interlocked posia5 spaced narrow passages 8, opening through the tion shown in Fig. 3. A partly soft or semi-hard front of the plug. rubber has been satisfactorily used. This ma- Also, the plug body is shown as having seats 9, terial may further harden with age, but this is no formed in its front face in line with the narrow disadvantage, since the parts are purposely interpassages 8, said seats being separated by an inlocked so that once assembled, they can not be 40 tervening partition or abutment portion l0. separated.

Within the chamber, a tapering projection ll While straight or other shaped contact blades forms a separator between the inner ends of pasmay be used, the spring contact type illustrated sages 8. Abrupt shoulders l2, at the inner ends is preferred, having the return end bends 20,

4.3 of passages B are provided substantially parallel for making yielding, self-adjusting gripping enwith and opposite the seats 9, at the outer ends gagement with the companion socket contacts.

of the passages. These generally parallel sur- This type of contact has rounded ends 2|, and a faces at the outside and the inside of the plug generally wedge-shaped formation which can be thus define in effect a transverse wall forming pulled through the passages 8, without tearing m) the front end of the plug and constituting a or otherwise permanently injuring the plug body. separator between the chamber at the inside and The spring tongues 20, in such case act as yieldthe end face of the plug. ing Spreaders, gradually opening up the passages The cord 13, may be of any usual or special de- 8, to admit the angled base portions I5. sign and is shown as entered loosely through The wall forming the front end portion of the the passage 1, and having the wires of which it plug body and through which the passages extend stantial base and support for the plug blades.

The transversely extending U-bends in the base portions of the blades form clamps which hold the blades in the end wall, resisting movement of the blades in all directions.

What is claimed is:

1. An attachment plug, comprising a one-piece molded resilient plug body having an internal chamber with a cord passage opening thereinto at the back of the body and having separated depressed seats molded in the front of the body,

said plug body having narrow spaced passages at the inner ends of said seats and extending from said seats, substantially parallel, to said chamber within the plug body and abrupt shoulders at the inner end of said chamber extending outwardly away from the inner ends of said passages and contact blades of substantially the' same 'tions engaging said outwardly extending abrupt shoulders at the inner ends of said passages, said wire terminal portions extending in sharply angled relation from the outer ends of said outwardly extending angled portions of said U- bends,

is relatively thick and heavy to provide a sub- 2. An attachment plug, comprising a one-piece molded resilient plug body having an internal chamber with a cord passage opening thereinto at the back of the body and having separated depressed seats molded in the front of the body, said plug body having narrow spaced passages at the inner ends of said seats and extending from said seats, substantially parallel, to said chamber within the plug' body and abrupt shoulders at the inner end of said chamber extending outward away from the inner ends of said passages and contact blades of substantially the same width full length, said blades having exposed contacting portions and wire terminal portions at opposite ends of the same and sharply angled inwardly extending U-bends in the intermediate portions of the same and of the full width of said blades, said U-bends includingsharply angled portions at the bases of the exposed contacting portions engaged in said depressed seats in the front of the base, longitudinally extending connecting portions extending through said-passages and sharply angled outwardly extending portions engaging said outwardly extending abrupt shoulders at the inner ends of said passages, said wire terminal portions extending in sharply angled relation from the outer ends of said outwardly extending angled portions of said U-bends and the exposed contacting portions of said blades comprising doubled back spring end portions with smoothly rounded bends forming the ends of the blades and inclined spring tongues, facilitating entry and passage of said contacting ends through said passages in said yielding molded plug body.

NATHAN CHIRELSTEIN. 

